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Open via DOI →Techniques for mobile multi-party digitally signed documents that allow detection of tamper. An issuing authority issues an authenticated base digital document, and aggregate documents comprising the base document and one or more attachments (such as visas or stamps) are created, updated, merged, and verified by multiple parties. Using digital signatures, Merkle-tree structures, and optional blockchain-based credential stores, updates can be performed and verified both online and offline, so that unauthorized modifications, removal of attachments, or concurrent changes can be detected and resolved by an arbiter. Assigned to International Business Machines Corporation.